Her lips trembled into a smile, but the eyes remained distant and serious, as if bent on some ineffable vision.
He took it up, and found himself plunged in an atmosphere unlike any he had ever breathed in books; so warm, so rich, and yet so ineffably tender, that it gave a new and haunting beauty to the most elementary of human passions.
There are no more uses of "ineffable" in the book.
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They were mystical experiences and were ineffable (incapable of being described in words).
She had been housed with the captain while the rest of them had gone on to entertain the commander; the doctor had reserved her, implying to the commander that she was not a virgin like the others, who would offer him the salubrious and then other ineffable effects of his taking their maidenhood, which to a soldier is like an amulet of life and rebirth.